EP0770805B1 - Berstscheibe - Google Patents

Berstscheibe Download PDF

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Publication number
EP0770805B1
EP0770805B1 EP96117017A EP96117017A EP0770805B1 EP 0770805 B1 EP0770805 B1 EP 0770805B1 EP 96117017 A EP96117017 A EP 96117017A EP 96117017 A EP96117017 A EP 96117017A EP 0770805 B1 EP0770805 B1 EP 0770805B1
Authority
EP
European Patent Office
Prior art keywords
flange
rupture disk
rupturable member
area
disk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96117017A
Other languages
English (en)
French (fr)
Other versions
EP0770805A2 (de
EP0770805A3 (de
Inventor
Stephen P. Farwell
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BS&B Safety Systems Ltd
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BS&B Safety Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BS&B Safety Systems Ltd filed Critical BS&B Safety Systems Ltd
Priority to EP03013573A priority Critical patent/EP1347222B1/de
Publication of EP0770805A2 publication Critical patent/EP0770805A2/de
Publication of EP0770805A3 publication Critical patent/EP0770805A3/de
Application granted granted Critical
Publication of EP0770805B1 publication Critical patent/EP0770805B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F16K17/1606—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type
    • F16K17/1613—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type with additional cutting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F16K17/1606—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F16K17/162—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the non reverse-buckling-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F16K17/162—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the non reverse-buckling-type
    • F16K17/1626—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the non reverse-buckling-type with additional cutting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1624—Destructible or deformable element controlled
    • Y10T137/1632—Destructible element
    • Y10T137/1692—Rupture disc
    • Y10T137/1699—Means for holding entire disc after rupture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1624—Destructible or deformable element controlled
    • Y10T137/1632—Destructible element
    • Y10T137/1692—Rupture disc
    • Y10T137/1714—Direct pressure causes disc to burst
    • Y10T137/1729—Dome shape
    • Y10T137/1737—Reverse buckling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1624—Destructible or deformable element controlled
    • Y10T137/1632—Destructible element
    • Y10T137/1692—Rupture disc
    • Y10T137/1744—Specific weakening point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/1624—Destructible or deformable element controlled
    • Y10T137/1632—Destructible element
    • Y10T137/1692—Rupture disc
    • Y10T137/1759—Knife or cutter causes disc to break

Definitions

  • the present invention relates generally to rupture disk apparatus and manufacturing methods, and more particularly, to rupture disks, assemblies, and manufacturing methods wherein the rupture disks have an area or areas of weakness to facilitate opening of the disk.
  • a pressure relief plate which is intended to replace a rupture disk, is known from GB 2 126 281.
  • This pressure relief plate which is preferably used in the wall of a combustion chamber in order to relieve excess pressure, has a flat central portion.
  • Another pressure relief device is known from GB 2 080 436. This pressure relief device is integrally formed with the wall of a pressurized container in order to release fluid from the container if an overpressure situation is encountered.
  • a great many pressure relief devices of the rupture disk type have been developed and used.
  • such devices include a rupture disk supported between a pair of support members or flanges, which are in turn connected to a relief connection in a vessel or system containing pressurized fluid.
  • the pressurized fluid within the vessel or system exceeds the design rupture pressure of the rupture disk, the disk ruptures causing pressurized fluid to be relieved from the vessel or system.
  • Rupture disks fall into the general categories of forward acting tension type disks and reverse acting disks. Certain forward acting tension type disks have been developed using a score line in the surface of the disk to ensure opening at a specific area. More recently, reverse buckling rupture disks have also included scores formed on a surface to define an area or areas of weakness such that upon reversal, the disk tears in such area or areas of weakness. Scored reverse buckling rupture disk manufacturing methods are described in U.S. Patent No. 4,441,350 to Short et al. issued on April 10, 1984 and U.S. Patent No. 4,458,516 issued to Naumann on July 10, 1984.
  • Such disks include, but are not limited to, an area or areas of weakness formed by one or more scores which define a circular or similar blow-out portion hinged to the reminder of the disk by an unweakened hinge area.
  • rupture disk assemblies have been developed that include a support member to contact the disk as it reverses and thereby lessen the chance of tearing away.
  • U.S. Patent No. 5,167,337 which represents the closest prior art, describes a C-scored reverse buckling rupture disk assembly that includes an inwardly extending support member for preventing the blow-out portion of the disk from fragmenting or tearing away at the hinge upon rupture.
  • a general problem in the manufacture of scored rupture disks that has continued to exist is that the tooling used to form the scores can be and often is damaged when the disk material is scored too deeply.
  • score dies of the type described in U.S. Patent Nos. 4,441,350 and 4,458,516 cited above can be and often are collided together which dulls or breaks the score blades requiring their repair or replacement.
  • Yet another problem with conventional scoring techniques is that the material directly under the score blade becomes work hardened such that it may be difficult to score the disk to a desired thinness.
  • Another problem that has existed in scored rupture disks prior to the present invention is the premature failure of the disks due to pressure cycling.
  • Pressure cycling occurs in many rupture disk applications and includes positive pressure variations, as well as going from a positive to a negative pressure. Fluctuation in the pressure of the pressurized fluid exerted on the rupture disks may cause them to flex, which in turn may cause the material forming the disks to fatigue and fail at the score or scores in the disks. This in turn results in the development of leaks and/or the premature failure of the disks.
  • the industry has attempted to minimize this fatiguing problem by supporting the scored region with, for example, the rupture disk head. However, this approach has not completely relieved the problem.
  • the present invention solves the above-described problems of the prior art by a reverse buckling rupture disk according to claim 1, and by a method of producing such a rupture disk according to claim 8.
  • the improved rupture disks of this invention have an area or areas of weakness therein at which the disks rupture or open.
  • the invention is comprised of a rupturable member formed of a material, preferably malleable, adapted to be sealingly engaged in a pressurized fluid passageway.
  • the disk includes at least one weakened region comprised of material displaced by a partial shearing movement to thereby form a thinner cross section than the remainder of the disk, with the material being displaced in a shear direction.
  • the weakened region is formed in or adjacent to the rupturable member such that it defines an area of weakness for opening, yet does not result in a region that is susceptible to fatigue failure.
  • the flange of the disk can act to support the weakened region and avoid the need to utilize a separate support member.
  • the rupture disk of the present invention may include a flange having an inner and outer peripheral edge, the flange being offset from the rupturable member of the disk to expose the peripheral edge of the rupturable member and the inner peripheral edge of the flange.
  • the peripheral edge of the rupturable member and the inner peripheral edge of the flange will be exposed on opposite sides of the fluid passageway, i.e. , on the inlet side of the disk and on the outlet side of the disk.
  • the weakened area includes a thinner cross section than the flange and rupturable member.
  • a method of producing improved rupture disks having an area or areas of weakness along which the disks rupture comprises the steps of forming a rupturable member, preferably of malleable material, adapted to be sealingly engaged in a pressurized fluid passageway, and forming an area or areas of weakness in or adjacent to the rupturable member, by displacing material with a partial shearing motion.
  • the weakened area or areas is/are preferably formed using dies which are offset and are incapable of colliding.
  • the weakened area may be formed such that the flange of the rupture disk acts as a support for the weakened area. As such, the fatigue life of the disk is improved when subjected to pressure variations in the fluid passageway.
  • a method of ensuring that a reverse buckling rupture disk having an area or areas of weakness formed therein ruptures after reverse buckling comprises placing a safety member adjacent to the rupture disk on the outlet side of the rupture disk, the safety member having at least one rupture initiating, stress concentrating point positioned to contact the rupture disk at the area of weakness when the rupture disk reverse buckles.
  • a rupture disk assembly of the present invention including a reverse buckling rupture disk having an area of weakness defined therein is illustrated and generally designated by the numeral 10.
  • the area of weakness is in the form of a continuous C-shaped curve.
  • the assembly 10 is comprised of an inlet rupture disk support member 12 and an outlet rupture disk support member 14.
  • a reverse buckling rupture disk and safety member assembly generally designated by the numeral 11 is shown clamped between the support members 12 and 14 by a plurality of bolts 16.
  • the support member 12 is sealingly connected to a conduit 18 which is in turn connected to a vessel or system (not shown) containing pressurized fluid to be protected.
  • the support member 14 is sealingly connected to a conduit 20 which leads pressurized fluid relieved through the rupture disk assembly 11 to a point of disposal, storage or the like.
  • support members 12 and 14 can be connected to corresponding pipe flanges.
  • the rupture disk and safety member assembly 11 is clamped between the support members 12 and 14.
  • a pair of gaskets 24 and 26 can be utilized, although in many instances such gaskets are unnecessary.
  • the rupture disk assembly 11 of the present invention is comprised of a rupture disk 28, such as the illustrated reverse buckling disk, and an annular safety member 36.
  • the rupture disk 28 is preferably formed of a malleable material and has an area of weakness 30 defined therein by an area or areas of material displaced by a partial shearing motion. As shown in FIG. 5(a) and as described more fully below, this partial shearing motion causes material displacement, but does not cut the disk.
  • the area of weakness 30 shown in FIGS. 1-4 in effect creates a continuous curved line of weakness along which the disk will tear, when subjected to a predetermined pressure differential.
  • the rupture disk 28 is positioned adjacent to the gasket 24, which is in turn positioned adjacent to the inlet support member 12.
  • the safety member 36 is positioned adjacent to the rupture disk 28, and the gasket 26 is positioned between the safety member 36 and the outlet support member 14. If gaskets 24 and 26 are omitted from the assembly of Fig. 1, the rupture disk 28 will contact the inlet support member and the safety member 36 will contact the outlet support member.
  • the rupture disk 28 includes a convex-concave portion 25 connected to an annular flange portion 27.
  • the convex-concave portion forms a convex surface in the side of the rupture disk 28 adjacent the inlet support member 12 and a corresponding concave surface in the side adjacent the outlet support member 14.
  • the area of weakness 30 formed by an area or areas of material displaced by a partial shearing movement in the reverse buckling rupture disk 28 defines a substantially circular blow-out portion 48, which is connected to the rupture disk 28 by an unweakened hinge area 50 between the opposite ends of the line of weakness 30, i.e. , the hinge area 50 corresponds to a chord of the substantially circular blow-out portion 48.
  • the safety member 36 is comprised of an annular ring 40.
  • this annular ring is in immediate face-to-face contact with the flange portion 27 of the rupture disk.
  • the inner diameter of the annular ring 40 preferably has a diameter that is just slightly less than the diameter of the C-shaped, curved line or area of weakness 30, so that the disk upon rupture can freely open without interference.
  • three rupture initiating, stress concentrating points 44 are provided on the inside edge of the annular ring 40 for contacting the rupture disk 28 when it reverse buckles, but does not rupture.
  • the points 44 are formed by pairs of adjacent arcuate cut-outs 46 in the ring 40.
  • at least the reverse buckling rupture disk 28 and the safety member 36 are preferably attached together such as by means of spot welds 38.
  • the annular ring 40, the stress concentrating points, and the arcuate cut-outs 46 are configured in combination so that the stress concentrating points 44 will contact a portion of the area 30 of weakness, should the disk reverse buckle but not immediately tear open.
  • the reverse buckling disk 28 reverses but does not immediately tear along the areas 30 of weakness and the disk is subjected to increased pressure, the disk adjacent the concentrating points 44 will move or deform into the arcuate cut-out areas 46 and effectively force the intermediate portion into contact with the points, initiating tearing along the weakened area 30.
  • the safety member 36 includes a member to contact the disk upon reversal.
  • catcher bar 42 is positioned adjacent the hinge area 50 and extends at least partially across the open interior of the outlet support member 14.
  • the hinge area 50 of the rupture disk 28 is supported and the blow-out portion 48 thereof is contacted and slowed down as it and the blow-out portion 48 bend into the open interior of the support member 14 as shown in FIG. 4.
  • the support of the hinge area 50 and slowing down of the blow-out portion 48 of the rupture disk 28 by the catcher bar 42 prevent the blow-out portion 48 from fragmenting or tearing away from the remaining portion of the rupture disk 28.
  • FIG. 5 provides a comparison of the prior art with the present invention.
  • FIG. 5(b) represents a rupture disk having a rupturable member 200 and a flange 202.
  • FIG. 5(a) represents a disk formed according to the present invention.
  • FIG. 5(c) represents a disk formed by prior art scoring techniques.
  • the improved reverse buckling rupture disk of the present invention has an area or areas of weakness defined therein by an area or areas of material displaced in a shear direction.
  • the area is preferably formed by two die members which are slightly offset from each other, but have two edges which are almost aligned with each other, as shown in FIG. 7 and described in more detail below.
  • the rupture disk of the present invention can include a central rupturable member 200 that will tear away from the rest of the disk at a predetermined pressure, the rupturable member including a peripheral edge 201.
  • the disk further includes a flange 202 having an inner and outer peripheral edge 204 and 203, respectively.
  • the flange is offset from the rupturable member to expose the peripheral edge of the rupturable member and the inner peripheral edge of the flange. This offset results in a weakened area 205 formed between these peripheral edges and having a thickness less than the thickness of the flange and rupturable member.
  • the edges of the flange and rupturable member may be radiused. As shown in FIG. 7, bulges may be formed in areas adjacent to the weakened area as a result of material displacement.
  • the peripheral edge of the rupturable member will be substantially parallel to and substantially aligned with the inner peripheral edge of the flange.
  • the inner peripheral edge of the flange 204 and the peripheral edge of the rupturable member 201 are formed on opposite sides of the fluid passageway and are substantially aligned.
  • the peripheral edge of the rupturable member may be formed on the inlet side and the inner peripheral edge of the flange is formed on the outlet side.
  • the peripheral edge of the rupturable member may be formed on the outlet side, and the inner peripheral edge of the flange may be formed on the inlet side.
  • the conventional, prior art scored rupture disk wherein a v-shaped notch is cut into the disk is illustrated in FIGS. 5(c), 6(b) and 6(c).
  • the term "score” is used herein to mean a groove or notch formed in one side of a rupture disk by a knife blade or similar tool to produce a line of weakness in the rupture disk whereby upon failure of the rupture disk, it tears along the line of weakness.
  • the prior art scored reverse buckling rupture disk 52 includes a score 54 which is essentially a groove formed in one side of the disk. The remaining thin portion 56 of the disk material beneath the score 54 connects the central blow-out portion 58 of the disk to the peripheral flange portion 60. The score 54 thus forms a line of weakness in the disk, and heretofore, one or more such scores have been utilized to form circular and other shaped blow-out portions connected by unweakened hinge portions in reverse buckling rupture disks.
  • the present invention substantially minimizes or avoids the bending action seen in prior art disks as a result of the scoring method.
  • one or more areas of weakness are defined in a reverse buckling rupture disk by an area or areas of material displaced by a partial shearing motion.
  • the area(s) of weakness can be formed at the periphery of the rupturable member or in the main body of the member in a manner similar to cross scoring. These areas are capable of linearly accepting compression forces and carrying the forces or force vectors directly along a line from the rupturable member to the supporting flange of the disk.
  • FIGS. 7-9 illustrate the method and dies used for forming an area or areas of material displaced by the partial shearing motion in a rupture disk of this invention.
  • FIG. 7 illustrates the die 66 in the process of forming the weakened area.
  • the weakened area includes a thinner cross section than the remainder of the disk as a result of having material displaced in a shear direction.
  • the degree of displacement can vary depending on the desired cross section in the weakened area.
  • the method of the present invention is believed to be capable of providing a weakened area of thinner cross section than conventional scoring techniques because it does not have the problem of work-hardened material forming under the score blade.
  • an area of weakness can be formed in a rupture disk 62 by a pair of dies 66 and 68 connected to appropriate tooling (not shown).
  • the die 66 is an annular ring utilized to stamp the area or areas of material displaced by the partial shearing movement into the rupture disk 62.
  • the die 68 is a second annular ring having an inside diameter slightly larger than the outside diameter of die 66. In this embodiment, the faces of the dies are parallel and almost in alignment with each other.
  • the die 68 holds the rupture disk in place during the stamping operation.
  • the dies 66 and 68 are preferably offset whereby they do not collide if the weakened region 64 is formed too deeply.
  • the method of the present invention for forming an area or areas of weakness in a rupture disk along which the disk ruptures is an improvement over prior art methods whereby the dies used can and do collide.
  • the tooling utilized for forming the score 54 in the rupture disk 52 illustrated in FIG. 5(c) includes dies which oppose each other similar to the dies illustrated in U.S. Patents Nos. 4,441,350 and 4,458,516 cited above. If the score 54 is formed too deeply, the dies collide causing damage to the dies and sometimes to the tooling connected to the dies.
  • pressurized fluid pressure from a vessel or system being protected is conducted to the rupture disk 28 by the inlet support member 12, but it is contained and prevented from entering the open interior of the outlet support member 14 by the rupture disk 28 so long as the pressure does not exceed the design rupture pressure of the rupture disk 28.
  • design rupture pressure is used herein to mean that fluid pressure exerted on the convex side of the rupture disk at which the rupture disk 28 is designed to reverse buckling and rupture.
  • the disk When the fluid pressure exerted on the rupture exceeds the design rupture pressure of the rupture disk 28, the disk reverse buckles and then tears in the area or areas of weakness 30 defined by the area or areas of material displaced in a shear direction.
  • the blow-out portion 48 opens as a result of the rupture of the disk 28, it is forced downward by the pressurized fluid being relieved through the disk 28 into contact with the catcher bar 42 of the safety member 36.
  • the catcher bar reinforces the hinge area 50 so that as the hinge area 50 bends, the blow-out portion 48 does not tear away at the hinge area.
  • the extended portion of the catcher bar 42 contacts and "catches" the blow-out portion whereby its movement downward is slowed down and fragmentation of the blow-out portion 50 does not result. It is contemplated that members other than the catcher bar can form a part of safety member 36 to perform the same function.
  • the rupture disk 28 has a longer service life than comparable prior art reverse buckling rupture disks.
  • the rupture of the disk 28 is assured by the safety member 36. That is, the rupture initiating, stress concentrating points 44 provided on the interior edge of the safety member 36 will contact a portion of the weakened area 30 and cause the rupture disk 28 to rupture in the area or areas of weakness 30 when the concave-convex portion of the disk 28 reverses and is bent over the points 44 by fluid pressure.
  • a reverse buckling rupture disk when a reverse buckling rupture disk reverses without rupturing, it can resist rupture up to dangerous high fluid pressures because of having high tensile strength.
  • a reverse buckling rupture disk must be designed to rupture in tension after reversal at a fluid pressure no greater than 1.5 times the design rupture pressure of the disk to assure the safe operation of the disk.
  • the safety member 36 with its cut outs and stress concentration points, is designed to assure that the rupture disk 28 ruptures in tension at such a safe pressure level, if it reverses without rupture.
  • the area or areas of weakness formed by an area or areas of material displaced in a shear direction in the rupture disk of this invention can define blow-out portions of various geometric shapes as dictated by design criteria.
  • a male/female die set is used to form the area of displaced material.
  • a die block is moved in a stamping or equivalent operation into contact with the disk. As shown in FIG.
  • the displacement of material by die block 66 is done in a partial shearing motion caused by the motion of the rupture disk dome relative to the disk flange.
  • the resulting area includes a thinner cross-sectional area that will facilitate opening of the disk.
  • the thinned area is capable of withstanding pressure variations because of an arch-like connection of the dome, weakened area, and flange.
  • the area or areas of material displaced by the partial shearing movement are formed in the rupture disk in a configuration which forms an area or areas of weakness defining a blow-out portion in the rupture disk.
  • the rupture disk preferably also includes an unweakened hinge area connected to the blow-out portion.
  • the blow-out portion defined by the area of weakness can take a variety of shapes, but is preferably circular.
  • the method of the present invention for assuring that a reverse buckling rupture disk having an area or areas of weakness formed therein ruptures after reverse buckling comprises placing an annular safety member adjacent to the rupture disk on the outlet side thereof which has at least one rupture initiating, stress concentrating point positioned to contact the rupture disk at the weakened region.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (12)

  1. Zurückwölbende Berstscheibe (28), die ein Berstelement (200), das eine konkav-konvexe Form hat, einen Flansch (202), der im Wesentlichen Kreisform hat und für einen Dichtungseingriff in einen Durchlass für unter Druck stehendes Fluid eingerichtet ist, und wenigstens einen abgeschwächten Bereich (205) umfasst, der in dem Berstelement (200) oder daran angrenzend ausgebildet ist, so dass er einen Ausbruchsteil (48) zum Öffnen des Berstelementes (200) in Reaktion auf unter Druck stehendes Fluid bildet, wobei des Weiteren der Ausbruchsabschnitt (48) durch einen nicht abgeschwächten Gelenkbereich (50) mit dem Flansch (202) verbunden ist und das Berstelement (200) relativ zu dem Flansch (202) zur Einlassseite der Scheibe (28) hin verschoben ist, dadurch gekennzeichnet, dass Material des abgeschwächten Bereiches (205) in einer Scherrichtung verschoben ist, um so einen dünneren Querschnitt als den des Berstelementes (200) auszubilden.
  2. Berstscheibe nach Anspruch 1, wobei das Berstelement (200) kreisförmig ist und der Ausbruchsabschnitt (48) im Wesentlichen kreisförmig ist und der Gelenkbereich (50) einer Sehne des Ausbruchsbereichs (48) entspricht.
  3. Berstscheibe nach Anspruch 1, wobei der Ausbruchsabschnitt (48) eine im Allgemeinen konkav-konvexe Form enthält.
  4. Berstscheibe nach Anspruch 1, wobei der ringförmige Flansch (202) mit dem Berstelement (200) durch den abgeschwächten Bereich (205) so verbunden ist, dass der Flansch (202) den abgeschwächten Bereich (205) trägt.
  5. Berstscheibe nach Anspruch 1, wobei der Flansch (202) eine innere und eine äußere Umfangskante (204, 203) hat, das Berstelement (200) eine Umfangskante (201) enthält und der Flansch (202) von dem Berstelement (200) versetzt ist, um den abgeschwächten Bereich (205) so auszubilden, dass die Umfangskante (201) des Berstelementes (200) und die innere Umfangskante (203) des Flansches (202) frei liegen.
  6. Berstscheibe nach Anspruch 5, wobei die Umfangskante (201) des Berstelementes (200) im Wesentlichen parallel zu der inneren Umfangskante (201) des Flansches (202) ist.
  7. Berstscheibe nach Anspruch 5, wobei die Umfangskante (201) des Berstelementes (200) mit der inneren Umfangskante (201) des Flansches (202) im Wesentlichen fluchtend ist.
  8. Verfahren zum Herstellen einer zurückwölbenden Berstscheibe (28) mit einem abgeschwächten Bereich (205), an dem die Berstscheibe birst, wobei das Verfahren das Ausbilden eines Berstelementes (200) aus verformbarem Material umfasst, das eine konkav-konvexen Form hat, die eine Einlassseite und eine Auslassseite für unter Druck stehendes Fluid enthält, die Berstscheibe (28) einen Flansch (202) enthält, der im Wesentlichen Kreisform hat und so eingerichtet ist, dass er dichtend in einen Durchlass für unter Druck stehendes Fluid eingreift, und einen abgeschwächten Bereich (205) aufweist, wobei der abgeschwächte Bereich (205) ausgebildet wird, indem ein Bereich von Material in dem Berstelement (200) mit einer Teil-Scherbewegung verschoben wird und die Verschiebung von Material eine Verdünnung in dem Querschnitt des abgeschwächten Bereiches (205) verursacht, so dass ein nicht abgeschwächter Gelenkbereich (50) zum Verbinden des Flansches (202) mit einem Ausbruchsabschnitt (48) zurückbleibt.
  9. Verfahren nach Anspruch 8, wobei die Teil-Scherbewegung in einer Richtung senkrecht zu dem Flansch (202) stattfindet.
  10. Verfahren nach Anspruch 8 oder 9, wobei die Verschiebung von Material verursacht wird, indem die Oberfläche des Berstelementes (200) mit einem Werkzeug (66) in Kontakt gebracht wird und die Oberfläche des Berstelementes (200) relativ zu dem Flansch (202) bewegt wird.
  11. Verfahren nach Anspruch 10, wobei die Verschiebung von Material bewirkt, dass der Flansch (202) so von dem Berstelement (200) versetzt wird, dass ein Teil einer Umfangskante (201) des Berstelementes (200) und ein Teil einer inneren Umfangskante (203) des Flansches (202) an einander gegenüberliegenden Seiten des Fluiddurchlasses freigelegt werden.
  12. Verfahren nach Anspruch 11, wobei die Umfangskante (201) des Berstelementes (200) und die innere Umfangskante (203) des Flansches (202) im Wesentlichen fluchtend sind.
EP96117017A 1995-10-24 1996-10-23 Berstscheibe Expired - Lifetime EP0770805B1 (de)

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US547311 1995-10-24
US08/547,311 US5934308A (en) 1995-10-24 1995-10-24 Rupture disk apparatus and methods

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JP (1) JPH09178076A (de)
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CA (1) CA2188229A1 (de)
DE (1) DE69635041T2 (de)
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Also Published As

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EP0770805A2 (de) 1997-05-02
US6192914B1 (en) 2001-02-27
DE69635041D1 (de) 2005-09-15
EP1347222A3 (de) 2006-03-08
CA2188229A1 (en) 1997-04-25
US5974851A (en) 1999-11-02
EP1347222A2 (de) 2003-09-24
EP1347222B1 (de) 2011-08-24
EP0770805A3 (de) 1999-01-20
US5996605A (en) 1999-12-07
DE69635041T2 (de) 2006-04-13
IN191054B (de) 2003-09-13
CN1158393A (zh) 1997-09-03
US5934308A (en) 1999-08-10
JPH09178076A (ja) 1997-07-11
CN1089415C (zh) 2002-08-21

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